17.5.10.4 The ndbinfo cluster_operations Table

The cluster_operations table provides a
per-operation (stateful primary key op) view of all activity in
the MySQL Cluster from the point of view of the local data
management (LQH) blocks (see
The DBLQH Block).

The following table provides information about the columns in
the cluster_operations table. For each
column, the table shows the name, data type, and a brief
description. Additional information can be found in the notes
following the table.

Column Name

Type

Description

node_id

integer

Node ID of reporting LQH block

block_instance

integer

LQH block instance

transid

integer

Transaction ID

operation_type

string

Operation type (see text for possible values)

state

string

Operation state (see text for possible values)

tableid

integer

Table ID

fragmentid

integer

Fragment ID

client_node_id

integer

Client node ID

client_block_ref

integer

Client block reference

tc_node_id

integer

Transaction coordinator node ID

tc_block_no

integer

Transaction coordinator block number

tc_block_instance

integer

Transaction coordinator block instance

The transaction ID is a unique 64-bit number which can be
obtained using the NDB API's
getTransactionId()
method. (Currently, the MySQL Server does not expose the NDB API
transaction ID of an ongoing transaction.)

The operation_type column can take any one of
the values READ, READ-SH,
READ-EX, INSERT,
UPDATE, DELETE,
WRITE, UNLOCK,
REFRESH, SCAN,
SCAN-SH, SCAN-EX, or
<unknown>.

The state column can have any one of the
values ABORT_QUEUED,
ABORT_STOPPED, COMMITTED,
COMMIT_QUEUED,
COMMIT_STOPPED,
COPY_CLOSE_STOPPED,
COPY_FIRST_STOPPED,
COPY_STOPPED, COPY_TUPKEY,
IDLE, LOG_ABORT_QUEUED,
LOG_COMMIT_QUEUED,
LOG_COMMIT_QUEUED_WAIT_SIGNAL,
LOG_COMMIT_WRITTEN,
LOG_COMMIT_WRITTEN_WAIT_SIGNAL,
LOG_QUEUED, PREPARED,
PREPARED_RECEIVED_COMMIT,
SCAN_CHECK_STOPPED,
SCAN_CLOSE_STOPPED,
SCAN_FIRST_STOPPED,
SCAN_RELEASE_STOPPED,
SCAN_STATE_USED,
SCAN_STOPPED, SCAN_TUPKEY,
STOPPED, TC_NOT_CONNECTED,
WAIT_ACC, WAIT_ACC_ABORT,
WAIT_AI_AFTER_ABORT,
WAIT_ATTR, WAIT_SCAN_AI,
WAIT_TUP, WAIT_TUPKEYINFO,
WAIT_TUP_COMMIT, or
WAIT_TUP_TO_ABORT. (If the MySQL Server is
running with
ndbinfo_show_hidden enabled,
you can view this list of states by selecting from the
ndb$dblqh_tcconnect_state table, which is
normally hidden.)

You can obtain the name of an NDB table from
its table ID by checking the output of
ndb_show_tables.